Tension device for shuttles



Dem 217, 19270 1,654,115 H. A. DAVOL.

TENSION DEVICE FOR SHUTTLESl Filed March 16, 1926..

M. wwww IN VEN TOR.

' ATTORNEY.

Patented Dec. 27, 1927.

UNITED STATES PATEn'r oFIcE.

HARRY ALTON DAVOL, OF METHUEN, MASSACHUSETTS, ASSIGlllOIt TO U. BOBBIN &

SHUTTLE CO., OF PROVIDENCE, RHODE ISLAND, A CORIEOHA'IION OF RlldtOlIlE Ifi LAND.

TENSION DEVICE FOR SI-IUTTLES.

Application filed. March 16, 1926. Serial No. 95,128.

This invention relates to threader blocks such as are used in shuttles, particularly those of the self-threading type.

It is particularly useful in connection with yarns of artificial silk, rayon, and other material which requires considerable carefully adjusted friction to prevent it from throwing or getting out of position.

It comprises an adjustable friction plate positioned between a friction member and a holding pin, having a hole between them for the passage of the whole or part of an adjusting guide screw, and a tension spring which bears on or is a part of the friction plate and whose pressure can be altered by said screw.

All these parts are so made and positioned that they can readily be removed and replaced by others.

In the drawings, Fig. 1 is a plan view of one end of a shuttle provided with my device.

Fig. 2 is a bottom plan view of the threader block removed from the shuttle.

Fig. 3 is a side elevation of the shuttle block from the side opposite the guide eye.

Fig. 4 shows a modified type of spring.

Fig. 5 is a side elevation of a shuttle block, from the side where the shuttle eye is located.

Fig. 6 is a back perspective and Fig. 7 is a front elevation of my shuttle block re moved.

Fig. 8 is a plan view of one end of a hand threading shuttle provided with my device.

Fig. 9 is an elevation of the reversible shuttle block shown in Fig. 8 from the side opposite the shuttle eye as it appears removed from the shuttle.

Fig. 10 is a back view or view from the right of Fig. 9 and Fig. 11 is a front view or view from the left of Fig. 9.

Fig. 12 is a plan of another modified type of friction plate.

Referring to the accompanying drawings, W indicates the body of the shuttle having a bobbin recess 1 in which is positioned the bobbin B of the usual kind, from which the thread Y extends through the threader block R in substantially the usual manner. There is the usual threading chamber 4 in the wood. and the corresponding threading chamber 5 in the threading block.

The top 20 of this block R is substantially hat and slopes down at 21 to a. front hook 23, and at the baclr to a barlr hoolr: in a well known manner.

The horn 32 is of the usual construction, but as shown in F 3, the thread pin 30, preferably slopes down and back so as to help keep the yarn down on the hard steel pin, or other bottom lriction F.

F may be a pin oil. hard steel or a cylindrical piece oi? glass, tel t, or in fact any other suitable material. extending transversely across the bottom, towards the front of the threading chamber.

The top friction is a plate H, preferably of sheet metal. which is flat at the bottom and extends up in what might be called a tail 40, the end of which rests against or around a holding pin 4:1 which extends across the upper back part of. the threading chamber. It is held up at the back and prevented from moving sideways by this pin 41 but it can readily be removed when screw A. is removed.

At its front end 42, it rests on the bottom Friction F.

There is also through it, a tension. screw hole 425 which registers with a hole t6 in the bottom 0'[ the bloclr, and with a recessat the top oi. the block whereby ten lOll. screw A, having the head 50 and shank 5i, threaded at can engage botl-l o-l. these holes from the recess This ten ion screw A is encircled by tension spring B between its head and the part 42 of friction plate T-I.

Friction plate H also has an upwardly extending guide tongue 43 which extends up and inward between the front hook and back hook 522, and sewe s to guide the thread Y down underneath part 4-2 and over the bottom friction F. i

The tension can be adjusted by turning screw A, and by removing screw A, the trio tion plate H can be talren out and replaced, and the spring B can also easily be replaced.

At the same time, the bottom friction F can be removed by knocking it out from the side.

I n'elerably utilize the usual stud 26 which extends down from the shuttle block R to receive the threaded end of screw A as this gives it a long bearing.

As shown in Fig. d, the friction plate such as L may itself be a spring, thus eliminating spring B The ends of L rest respectively on friction means F and holding pin 4]. while the ad justing screw M is threaded at 131 into the body '132 of the threading block and has a head 130 which rests or bears against washer 135 on top of L.

The width of the tail such as 40 should preferably be slightly less than the exposed part of pin il so that there will be little lateral motion. This, together with the screw B which passes through guide screw hole 45, holds plate H in position from lateral movement while the vertical movement is resisted by spring 13.

By ren'ioving the screw such as A or M, spring B if used, and plate H or L, can readily he slipped out.

In Figs. 8, 9, 10 and 11, I show a hand threading shuttle T having the usual threading slot 150 and thread guide pin 151 with a double ended block.P in place.

This has at the front and back, the back guides 61 and 62, in each of which may be inserted a holding pin such as 63 from a hole such as 64 at each end of the top of the threading chamber 60, while at the front and back at the bottom, are the holes ()6 and 67, through which may be passed either a retaining screw to hold the block in place, of the usual type, or a friction member such as F.

The friction plate R may be the same as H but it is obvious that by turning it end for end as shown by the dotted lines in Fig. 9, this block can be used in a shuttle with either a right hand eye or a left hand eye. The only difference is that the friction plate is reversed and the bottom friction member I changes places with the holding screw in the holes 66 and 67.

As shown in Fig. 12, I may use a friction plate 7 0 having a tail 71, a screw guide hole 74, and a wide guide tongue 72 which is bent in at 73 so that'it will partly extend over the head of a screw such as A shown in the dotted line.

I claim:

1. The combination in a threading block for shuttles having a threading chamber, a back guide which extends downward into said chamber, and a screw recess; of a bottom friction member positioned near the front bottom part of said threading cham her; a holding pin positioned near the back top part of said threading chamber; a friction plate positioned on and between said friction member and said holding pin, said friction plate having a guide wing which cooperates with said back guide and a medially located tension screw hole; a screw whici extends vertically through said screw hole in line with the screw recess, and enters the bottom of the threading chamber; and a tension spring which surrounds said screw between its head and the friction plate.

2. The combination in a threading block for shuttles having a threading chamber, a back guide which extends downward into said chamber, and a screw recess; of a bottom friction member positioned near the front bottom part of said threading chamber; a holding pin positioned near the back top part of said threading chamber; an elastic friction plate positioned on and between said friction member and said holding pin, said friction plate having a guide wing which cooperates with said back guide and a medially located tension screw hole; and a screw having a head which bears on the friction plate and a shank which extends vertitically through said screw hole in line with the screw recess and enters the bottom of the threading chamber.

3. The combination in a threadin block for shuttles having a threading chain er; of a bottom friction member positioned near the front part of said threading chamber; a holding pin positioned near the back part of said threading chamber; a friction plate p0- sitioncd on and between said friction member and holding pin and having a mediall located tension screw hole; a screw whicli extends vertically through said screw hole and enters the bottom of the threading chamher; and a tension spring between the screw head and the friction plate.

4. The combination in a threading block for shuttles having a threading chamber; of a bottom friction member positioned near the front part of said threading chamber; a horizontal holding pin positioned near the top back part of said threading chamber; a friction plate positioned on and between said friction member and holding pin and having a medially located tension screw hole; a screw having a head which extends vertically through said screw hole and enters the bottom of the threading chamber; and a tension spring between the screw head and the friction plate.

HARRY ALTON DAVOL. 

